AWS: Multiple If/Else Statements in CloudFormation/SAM Template

The other day I needed to build a complex IF / ELSE block in CloudFormation/SAM template. Finding a working example was hard so here’s what I created.

This was in the context of creating a Lambda function that was triggered/executed by a CloudWatch Rule cron job for which I wanted to have an Event type “Schedule” with a JSON input.

Resources:
  MyLambda:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: MyLambdaName_other_lambda_properties_are_ommitted
      Events:
        MyCloudWatchEventRuleToTriggerMyLambda
          Type: Schedule
          Properties:
            Schedule: "rate(1 hour)"
            Name: MyRuleScheduleName
            Description: Below is the IF, ELSE block with JSON example
            Enabled: True
            Input: !If
              - CreateDevResources
              - >-
                {
                  "actionRequired": "TestData",
                  "thisManyMinutesApart": "10"
                }
              - !If
                - CreateTestResources
                - >-
                  {
                    "actionRequired": " TestData ",
                    "thisManyMinutesApart": "20"
                  }
                - !If
                  - CreateProdResources
                  - >-
                    {
                      "actionRequired": " TestData ",
                      "thisManyMinutesApart": "30"
                    }
                  - !Ref AWS::NoValue